Photographic glass-rack



UNITED STATES PATENT GEEICE.

WILLISON G. SMITH, OF CARLISLE, PENNSYLVAIA.

PHOTOGRPHIC GLASS-RACK.

Specification forming part of Letters Patent No. 45,648. dated Decembel`27, 1864.

T0 all whom it may concern:

l of corrugated metal a, whose grooves or de- Be. it known that I,WILLIsoN G. SMITILot' pressions should be of the same width andCarlisle, in the county of Cumberland and State ot' Pennsylvania7 haveinvented a new and useful Improvement in Photographic Racks; and I dohereby declare that the following is a full, clear, and exactdescription thereof, which will enable those skilled in the art to makeand use the same, reference being had to the accompanying drawing,forming part of this specification.

The drawing consisting of one figure, represents my improved rack inelevation.

The racks now used in the photographic art for preserving and dryingnegativesand other plates of glass and metal are shelves of wood withgrooves sawed out cr otherwise cut upon their faces, usually by hand,and requiring skillfulness in the workman and the best of material,because it is necessary that the grooves be cut true and that they becoincident with those in the opposite shelves, and that they be notliable to become distorted by warping or by the contraction andexpansion ot the wood in which they are cut.

My improvement consists iu constructing a frame like, A, with as manycross pieces B U l) as are required for the siae and height or capacityof the case. The breadth of the cross-pieces and upright sides is to beabout as shown in the drawingsuf'icient to make a secure berth for theglass or plate used. Upon the opposite 'aces of the cross pieces B C l),l secure, by tacking or otherwise, 'stri ps depth, and those of oppositestrips be opposite to each other, so that the panes of glass or plateswhen inserted in the grooves shall stand in vertical parallel planes.

The strips or plates of metal may be corrugated in any suitable way. It'of sheet metal, they. may be swaged or crimped, and if cast theircorrugations may be formed in that operation 5 or they may be formed inany other way by which a corrugated surface can he produced, or guides,which would be equivalent to the corrugations, may be made upon ametallic or other suitable surface secured to the shelves.

By constructing racks in this Way they will hold about double the numberot' negatives of the ordinary wooden cases. I distinguish the groovesofthe rack, as shown, by attaching a number opposite each series, so asto assist the operator in enumerating the plates of glass or metal andenable him readily to select the required plate or glass.

y I claim as new and desire to secure by Letters Patent- (Jonstructiugthe grooves on the shelves of photographic racks substantially as abovedescribed.

WILLISON G. SMITH.

Witnesses:

W. M AGEEELY, JNO. MGFEELY.

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